K. K. Kamau, G. Magoma, A. O. Kwallah, C. K. Syengo, and M. Mwau, “Seroprevalence of chikungunya fever virus and O’nyong Nyong fever virus among febrile patients visiting selected hospitals in 2011-2012 Trans Nzoia County, Kenya”, Int J Res Med Sci, vol. 6, no. 6, pp. 1913–1921, May 2018.